/* regex-tester.css — tool-specific styles only */

.regex-main {
    max-width: 860px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* ── Panels ────────────────────────────────────────────────────────────────── */
.panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.25rem;
}

/* ── Regex input row ───────────────────────────────────────────────────────── */
.regex-row {
    display: flex;
    align-items: center;
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--color-surface);
    margin-top: 0.4rem;
}

.regex-slash {
    padding: 0.7rem 0.6rem;
    background: #f0f0f0;
    color: #888;
    font-family: var(--font-mono);
    font-size: 1.1rem;
    user-select: none;
    line-height: 1;
}

.regex-input {
    flex: 1;
    padding: 0.7rem 0.6rem;
    border: none;
    outline: none;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-surface);
    min-width: 0;
}

/* Flag toggle buttons inside the regex row */
.flag-toggles {
    display: flex;
    gap: 0;
    background: #f0f0f0;
    border-left: 1px solid var(--color-border);
}

.flag-btn {
    padding: 0.7rem 0.7rem;
    border: none;
    background: transparent;
    color: #888;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    line-height: 1;
}

.flag-btn:hover {
    background: #e0e0e0;
    color: #444;
}

.flag-btn.active {
    background: var(--color-primary);
    color: #fff;
}

/* Error message */
.regex-error {
    margin-top: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: #fff0f0;
    border: 1px solid #f5c2c2;
    border-radius: var(--radius-sm);
    color: #c00;
    font-size: 0.88rem;
}

.regex-error.hidden { display: none; }

/* ── Test string with highlight overlay ───────────────────────────────────── */
.test-wrap {
    position: relative;
    margin-top: 0.4rem;
}

/* The highlight layer sits behind the textarea and mirrors its content.
   Matched spans inside get coloured backgrounds. */
.highlight-layer {
    position: absolute;
    inset: 0;
    padding: 0.75rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    overflow: hidden;
    pointer-events: none;
    border: 1px solid transparent; /* match textarea border width */
    border-radius: var(--radius-sm);
    color: transparent; /* text invisible, only highlights show */
    box-sizing: border-box;
}

.test-textarea {
    position: relative;
    background: transparent;
    caret-color: var(--color-text);
    min-height: 120px;
    width: 100%;
    /* Must exactly match highlight-layer metrics */
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.5;
}

mark.hl {
    background: rgba(74, 144, 226, 0.25);
    border-radius: 2px;
    color: transparent;
}

/* ── Results ───────────────────────────────────────────────────────────────── */
.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.match-badge {
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    background: var(--color-primary);
    color: #fff;
}

.match-badge.none {
    background: #bbb;
}

.match-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 320px;
    overflow-y: auto;
}

.no-matches {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-style: italic;
}

.match-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem;
    font-size: 0.88rem;
}

.match-card-top {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.match-num {
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

.match-value {
    font-family: var(--font-mono);
    background: rgba(74,144,226,0.12);
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    word-break: break-all;
}

.match-pos {
    color: #999;
    font-size: 0.8rem;
    white-space: nowrap;
}

.match-groups {
    margin-top: 0.4rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.group-row {
    display: flex;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.group-idx {
    color: var(--color-primary);
    font-weight: 700;
    min-width: 1.5rem;
}

.group-val {
    color: var(--color-text-muted);
    word-break: break-all;
}

/* ── Code snippets ─────────────────────────────────────────────────────────── */
.snippet-tabs {
    display: flex;
    gap: 0.4rem;
}

.snippet-tab {
    padding: 0.3rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    font-family: var(--font-main);
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: background 0.15s, color 0.15s;
}

.snippet-tab.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.code-block {
    margin: 0.75rem 0 0.5rem;
    padding: 0.85rem 1rem;
    background: #1e1e2e;
    color: #cdd6f4;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    overflow-x: auto;
    white-space: pre;
}

.copy-btn {
    padding: 0.35rem 0.9rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s;
}

.copy-btn:hover { background: var(--color-primary-dk); }
.copy-btn.copied { background: #28a745; }

/* ── Collapsible reference panels ─────────────────────────────────────────── */
.collapsible-panel {
    padding: 0;
}

.panel-summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.panel-summary::-webkit-details-marker { display: none; }

.collapsible-panel[open] .panel-summary {
    border-bottom: 1px solid var(--color-border);
}

.reference-grid,
.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.6rem;
    padding: 1rem 1.25rem;
}

@media (max-width: 500px) {
    .reference-grid,
    .guide-grid {
        grid-template-columns: 1fr;
    }
}

.ref-item,
.guide-item {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    font-size: 0.88rem;
}

.ref-item code,
.guide-item code {
    font-family: var(--font-mono);
    background: rgba(74,144,226,0.1);
    color: var(--color-primary);
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    white-space: nowrap;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.ref-item strong {
    white-space: nowrap;
    flex-shrink: 0;
}

.ref-item span,
.guide-item span {
    color: var(--color-text-muted);
}

.guide-section {
    padding: 0.75rem 1.25rem 0;
}

.guide-section:last-child {
    padding-bottom: 1rem;
}

.guide-section h3 {
    margin: 0 0 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}